I mentioned the snow slab as you thought it was weird that Semyon would die from a snow slab given his military experience. I don't think they are connected. The snow slab is specific to avalanches. Anyway , that's the tent and a multitude of things could have made them leave.
Back to the topic of fractures at the ravine. Not technically smashed bones.
Let's ask a question, or actually two questions.The ravine 4 were under 3 meters of snow, so,how did they get under the snow? And/ or how did the snow get on top of them?
A possabile way for them to be under that snow , is to dig a snow hole or cave. We need to have a large snow drift( yep ,we do) in the ravine or the possibility for a snow bridge( yep, we have that too) . They could Crawl in and scoop the snow out, use feet, one of the branches etc. Or, it could be a natural snow bridge or cave formed early in the season.
A snow bridge is an arc formed by snow across a crevasse, a crack in rock, a creek, or some other opening in terrain.[1] It is typically formed by snow drift, which first creates a cornice, which may then grow to reach the other side of the opening.
https://en.wikipedia.org/wiki/Snow_bridgeThis next link shows great examples of a snow bridge in picture form as well as explanations of where they are found and how the are formed. Quite often over creeks and streams, all of various sizes and altidues.
https://www.mountaineers.org/blog/unseen-danger-navigating-snow-bridge-hazardsHere's a video link to give an example.not the best example but it's all I could find.
So, they could have found a snow cave, made it bigger etc and the snow fell on top of them, this fits with a land fill crush on the rib cages. A quick and sudden mass falls on top of them. ( Theres medical data on this)
Or they could have been walking on the snow bridge and it collapsed, this is not so easy to explain the injuries but others may have fell on top of them.
They may have been stuck in the hole with no easy way out , especially with the rib fractures. Perhaps the two Yuri's were in the hole with them with them. Got wet and started cutting their trousers there and administrating first aid . Obviously the badly injured couldn't get out. The Yuri's, now wet from the stream go to the ceder to make a fire as that's all they can do , the other three have to get supplies from the tent. Anyway there are many possibilities.....
So that's maybe how they got under the snow.
Now, If we look at how the snow may have got on top of them as opposed to how they got under the snow, if the ravine was empty, all the way down to the stream level when they died at the end of January then we only have two options ,
1) it snowed......a lot and the ravine was empty all season before the hikers turned up and it then filled up to cover them with 3 meters of snow to conveniently keep us guessing for decades.
2) someone else did it and decided to bury them with tons of snow.
So back to the injuries, we have snow, lots of it by the way and Crush impact injuries , similar to what would be sustained if you were lying in a hole on rocky ground and someone dumped an instant mass of earth, sand , snow on top of you. You have hard ground, large mass above you and your body is in the middle.
Or, the injuries happened somewhere else and someone put all that snow on top of them.